Air compressor



FIG. 1 is a perspective view of an air compressor showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

In the above drawings the broken lines and the areas within the broken lines form no part of the claimed design. 

CLAIM The ornamental design for an air compressor, as shown and described. 